NEW YORK (CBSNewYork) — All it takes is one big hit.

As CBS 2′s Cindy Hsu reported, a growing number of schools are turning to technology to identify concussions as soon as they happen on the football field. But the technology might not always be reliable, researchers found.

Eric Sweeney, a 13-year-old football player, suffered a concussion a few weeks ago making a tackle.

“Shocked,” he described. “It felt all fuzzy in the back of my head.”

Despite feeling fuzzy, Sweeney wanted to stay in the game. But he was stopped by a concussion sensor worn under his helmet.

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